In Flash CS3/AS3, if I try to run a transition on a movie
clip "PaneB" accompanied by a PaneB class definition, I get the
ReferenceError: Error #1069: Property __transitionManager not
found on Site.Page.PaneB and there is no default value.
However, if I don't associate a class with PaneB (leaving
Flash to define a default one), I don't get the error. Any idea
FYI, if I create a child clip (for PaneB) without a class
attached, and then run transition on that child, things work OK.
And, if I create a new movie clip at run time and add PaneB as its
child and then run transiton on the parent, it also works fine.
Meaning, there's something that the default class definition is
doing that my class (that extends MovieClip) is not doing. Happens
even if I don't define anything in the class!